Locked password iPhone 6 plus Why would someone pay 200 Or 300 for a locked phone?

If they want it can't it be unlocked?

You're confusing passwords with provider locks.

A locked phone doesn't mean it has a password, it means that the software is locked to a given service provider - the phone will only work on that network. Unlock it and you can use it on other networks just by using another SIM card.